The Quick Read: It depends on what you still owe on the first mortgage, because a 70% combined loan-to-value ceiling covers every loan on the rental together, so the new line equals 70% of the property’s value minus your first mortgage balance, and a second-lien line can never exceed $500,000, subject to underwriting.
- The formula: value × 0.70, minus the first mortgage balance, equals the most the new line can be.
- The full limit counts: the line’s whole credit limit goes into the math, not just the drawn amount.
- The credit tier: a second lien at 70% combined leverage needs a 720 credit score or better, through select programs.
- The rent test: the rental must cover a stress payment on the entire limit at 1.10x or better.
- The floor: lines start at $50,000, so thin equity can rule a deal out even when the formula shows a positive number.
What Is a DSCR HELOC, and Why Does 70% Combined Matter?
A DSCR HELOC is a revolving line of credit secured by a rental you own. It qualifies primarily on the property’s rental income covering the payment, subject to lender guidelines. No traditional personal-income documentation, W-2s or personal income calculation are part of the test.
The line sits as a standalone second lien behind the first mortgage you keep. It can also be a standalone first lien on a rental with no mortgage. It is never closed with a purchase and never placed on your own home. Investors like it because the low-cost first mortgage stays untouched and you reach equity without a refinance.
The 70% figure is a ceiling on all debt against the property. It is not the size of the line. Lenders add every loan secured by the rental, then divide by value. That is why two owners with the same property can get very different line sizes.
How Do You Calculate the Maximum Line?
Use four steps, and the lender’s own calculation governs the final number.
1. Set the value. A valuation sets the denominator. Everything else scales from it.
2. Take 70% of that value. This is the total debt the rental can carry on a second-lien file.
3. Subtract the first mortgage balance. Add any other liens too, though a program like this one does not allow a third lien.
4. Compare the leftover with the program limits. Second-lien lines run from $50,000 up to $500,000. Whichever is smaller, the room or the cap, sets your ceiling.
The CFPB’s HELOC booklet uses the same mechanic for home equity lines in general. It multiplies appraised value by a percentage, subtracts what you owe, and treats the remainder as the potential line. Only the percentage and the limits change between programs.
What Does the Sizing Grid Look Like?
The grid below shows the room left under the 70% ceiling at different first mortgage sizes. Everything is a share of property value, so you can multiply by your own number.
| First mortgage (% of value) | Room under 70% ceiling | What it means |
|---|---|---|
| 30% | 40% of value | Plenty of room, the $500,000 cap may bind first |
| 40% | 30% of value | Strong room on most rentals |
| 50% | 20% of value | Workable, sensitive to value changes |
| 60% | 10% of value | Thin, the $50,000 minimum may block it |
| 65% | 5% of value | Rarely practical |
| 70% or more | None | No second-lien room |
Take a rental with a first mortgage equal to 50% of value. The ceiling leaves 20 points of value for the new line. Multiply 20% by your appraised value and you have the maximum, before checking the limits.
Now compare an owner at 40%. That owner has 30 points of room, which is half again as much on the same property. Paying the first mortgage down, or buying with a larger down payment, matters more here than most investors expect.
When Does a Cap Bind Before the Formula Does?
The dollar limits can bind at either end. Knowing which one applies saves you from planning around a number the program will not write.
The $500,000 cap binds on high-value rentals. If your room is 20% of value, the cap only matters once the property is worth more than five times the cap. At 40% room, it bites at a value over 2.5 times the cap. Owners with low balances on expensive rentals hit the ceiling first.
The $50,000 floor binds on thin equity. A 10% room needs a property worth at least ten times the minimum line. A 5% room needs twenty times. Below those values the formula shows a positive number, yet no line exists to write.
The closing draw sets a floor too. At least 80% of the line is drawn at closing, and the closing draw is at least $50,000. On the smallest lines, that means the whole line is drawn at closing. Later draws must be at least $5,000 each. So you cannot size a large line and leave most of it idle as a reserve.
Does the Undrawn Part of the Line Still Count?
Yes. Combined leverage is measured against the full credit limit, not the balance you carry. A $200,000 limit with a small balance still uses the full limit’s share of the ceiling. That is why the draw rules above matter: most of the line is funded anyway.
The same logic applies to the rent test. The rental must cover a stress payment, which is a fully amortizing payment on the entire limit at a rate two percentage points above the start rate. The minimum coverage is 1.10x, gross monthly rent divided by that payment. Taxes and insurance are not part of the qualifying payment. The test ignores the interest-only draw period, which is why a line can pass the formula and still fail on rent.
Rent is the lesser of the appraisal’s market rent and the lease, unless three months of receipts support a lease above market. A lease must be in place, and a two-to-four-unit property may have at most one vacant unit. Confirm on the file how the lender treats the first mortgage payment in the second-lien coverage calculation, because it is not part of the published parameters.
What Shrinks the Line Besides the First Mortgage?
Five things can pull the number below the clean formula.
- Credit tier. A second lien at 70% combined needs 720 or better. Below 720, there is no second-lien tier through this program.
- Valuation method. Lines up to $400,000 can use an automated valuation (confidence score 85 or better) with a property inspection report, or a full interior appraisal. Larger lines take a full interior appraisal. Appraisal waivers are not accepted.
- Market flags. A declining-market flag lowers the ceiling by 5 points. Philadelphia lines carry a ceiling 10 points lower.
- Value movement. Room is leveraged to value. Say the first mortgage equals 50% of value and the value drops 10%. The ceiling falls to 63% of the original value, so room shrinks from 20 points to 13, a drop of about 35%.
- Property type. Single-family, PUD, townhome, two-to-four units and condominiums are eligible. Rural-designated property, row homes, condotels, leaseholds, mixed-use and a few others are outside the program.
The same logic applies to first-lien lines on a rental with no mortgage. Leverage there is loan-to-value rather than combined: up to 75% at 740 or better, 70% at 700 to 739, and 65% on lines above $500,000 (to $1,000,000) at 720 or better.
What Else Does the File Need?
Beyond the math, a few program conditions decide whether the line is written. All are subject to underwriting.
A rental bought or refinanced inside the last 6 months is not eligible (that clock runs from the last note date to the new note date), and the owner must have held title for 6 months (settlement date to note date). Credit history rules require no 30-day mortgage late in the last 12 months, and 48 months since a bankruptcy, foreclosure, short sale or deed-in-lieu. No reserves and no cash to close are required. Exposure is limited to 5 loans or $2,500,000 per borrower with the program.
Title can sit in your LLC, depending on program guidelines. Borrowers must be US citizens, permanent residents, or non-permanent residents with a Social Security number. Foreign nationals and ITIN borrowers are not eligible.
Availability depends on the state where the property sits, so confirm your state before planning around this line. Lendmire is a broker that places the file with a wholesale lender, and the lender approves it.
How Does a Rental HELOC Compare With the Alternatives?
Which product fits depends on whether you want to keep your first mortgage and whether you want one lump sum or a revolving line.
| Factor | DSCR HELOC | Closed-end second | DSCR cash-out refinance |
|---|---|---|---|
| Structure | Revolving line | One lump sum | Replaces first mortgage |
| First mortgage | Stays in place | Stays in place | Paid off and replaced |
| Sized on | Combined leverage | Combined leverage | The new first loan |
| Best for | Keeping a low-cost first | Single known expense | Large equity, higher balance |
A closed-end second is a different product from this program, and its terms vary by lender. A cash-out refinance resets the first mortgage entirely.
Lenders differ on how far they will go. NerdWallet notes that many lenders set thresholds below 70% because they view default risk as higher. This program’s second lien allows up to 70% combined leverage at a 720 credit score or better, subject to underwriting.
What If No Room Is Left?
If your first mortgage is at or above 70% of value, a second-lien line is not available. You have three practical paths.
1. Wait for paydown or appreciation. Either one widens the gap between the ceiling and what you owe.
2. Look at a cash-out refinance. It replaces the first mortgage and is sized on the new first loan’s leverage. You give up the existing first mortgage, so weigh that against the equity you want.
3. Use a different property. Another rental with a lower balance may have the room this one lacks.
The line also does not buy the next property directly. It produces cash, and the lender on the purchase decides whether borrowed funds are acceptable for the down payment. Short-term rental rules can vary by city, county, HOA and property type, so investors should confirm local rules before relying on projected rental income.
Key Terms Defined
Combined loan-to-value (CLTV): the first mortgage balance plus the new line’s full limit, divided by the property’s value.
Second lien: a loan recorded behind the first mortgage, which gets paid first if the property is sold.
DSCR: the debt-service coverage ratio, meaning gross monthly rent divided by the qualifying payment.
Stress payment: the qualifying payment, a fully amortizing payment on the entire limit at a rate above the start rate.
Draw period: the stretch when you can borrow against the line. Here it is 5 years interest-only on the drawn balance, followed by a 25-year repayment period and a 30-year maturity with a variable rate.
A HELOC is open-end credit, meaning you can borrow, repay and borrow again up to the limit.
For the broader picture of how rent-qualified lending works, read Lendmire’s complete DSCR loans guide.
Frequently Asked Questions
Is the 70% a limit on the new line or on all my debt?
It is a limit on all debt secured by the rental. The new line only gets what is left after the first mortgage. If you owe 55% of value, the room is 15% of value, subject to the $50,000 minimum line.
Can I borrow 70% of my rental’s value on a first-lien line?
Yes, at the 700 to 739 tier, where first-lien leverage tops out at 70% loan-to-value. At 740 or better it reaches 75% on lines up to $500,000, and lines above $500,000 are held to 65% at 720 or better. A first lien exists only on a rental with no mortgage.
How long must I own the rental before applying?
Two six-month clocks apply: the line is not available on a rental bought or refinanced in the last 6 months (last note date to new note date), and title must have been held for 6 months (settlement date to note date). Both are subject to underwriting.
Does a lower credit score still get a second lien?
Not at this program’s tiers. A second lien starts at a 720 score, and there is no second-lien tier below it. A score of 700 to 719 only opens first-lien lines on rentals with no mortgage, so a borrower who keeps a first mortgage would need a different product.
Can my LLC hold title to the rental?
Yes, depending on program guidelines. The members sign as guarantors, and a title holder who is not a borrower signs a non-borrowing owner acknowledgment. The line is for investment property only.
Next Steps
If you are considering a home equity line on a rental property and want to see how the numbers work, Lendmire can help you compare DSCR HELOC options based on the property, the rent, the equity available, credit profile, combined leverage, and your goals. Programs change and every file is underwritten individually. None of this is a commitment to lend.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage broker that arranges DSCR home equity lines of credit on rental property in 15 of its 16 licensed states (every licensed state except Tennessee) through wholesale lenders. The line is qualified on the rental’s rent rather than the owner’s personal income, and every line is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
2. NerdWallet – HELOC on investment property
This article is part of Lendmire’s DSCR HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Get a DSCR HELOC on a Rental Your S-Corp Owns? · DSCR HELOC Requirements to Pay Off a Family Loan or a Partner · DSCR HELOC Requirements With One Year of History
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.